Fungible goods origin rules require physical segregation or consistent GAAP inventory methods to claim origin.

Fungible goods are treated as originating either by physical separation or by using an inventory management method recognised in the Generally Accepted Accounting Principles of the Party where production occurs, provided the selected method is used throughout the fiscal year. Any inventory management system must ensure that no more goods receive originating status than would have occurred if the fungible goods had been physically segregated.

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